Trackless door-hanger.



PATENTED 00T. 9, 1906.

A. THBYSKENS.

TRAGKLESS DOOR HANGER.'

APPLICATION FILED APR.26,1905,l

PLI

- II I I I I I I I I I I I I I @MLM/ rm: Manns perras c'u., wumnaron, n. c`

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented Oct. 9, 1906.

Application med Apre 26.1905. serial No. 257,472.

To all whom it may concern:

Beit known that I, ALPHONSE THEYsxENs, engineer, a Subj ect of the Belgian King, residing at Brussels, Belgium, have invented a new and useful Improvement in Trackless Door-Hangers; and I do hereby declare the following to be a full, clear, and exact description of the same.

My present invention relates to trackless door-hangers for sliding doors, the object being to provide a door (or window) of this kind the two leaves of which are always counterbalanced on the ends of fulcrumed levers, (balance-beams,) so that both leaves are moved in their plane like the basins of a balance, said leaves remaining constantly parallel to each other when moved conjcintly throu h arcs the chords of which are approximate y at right angles with the line of separation of the closed door-leaves.

Figure l is a view in elevation, showing the position of the parts when the doors are closed. Fig. 2 is a similar view showing the position of the parts when the doors are open.

The sides a b and c d of said parallelogram are fulcumed on the pins e e, secured to the walls of the door-frame. Each leaf f of the door is provided, the one at the upper edge with an extension g, pivotally connected at c to the lever c d and at a to the lever a b, the other leaf having at its lower edge a similar extension h, pivotally connected at d to the lever c d and at b to the lever a b. The levers a b and c d form the beams of a balance, the basins of which are formed by the leaves ff of the door.

directions when the door is opened or closed are of very small amplitude.

In contradistinction to the sliding doors heretofore known and constructed, the leaves of my improved door as they move laterally follow arcs or circles, the one rising slightly as the other falls, so that the two leaves are counterbalanced in any position. The movements of the leaves are effected in an easy way, as there is only an insignificant friction produced on the pins e e and pivots a b c d. It will be understood that steel prisms may be substituted for all the pivot-pins, and in this case the necessary power for moving the doorleaves is reduced to that which causes the balanced basins of a balance to swing.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a two-leafed door, the combination, With the door-frame, of sliding doors, levers fulcrumed in said frame the one on one side and the other on the other side of said doors,

and extensions carried the one by one door at the top thereof and extending toward one lever and the other by the other door at the bottom thereof and extending toward the other lever, each lever being connected at one end with a door and at the other end with an extension, substantially as described.

2. In a two-leafed door, the combination with the door-leaves and the door-frame, of fulcrumed levers in said door-frame, means for connecting the door-leaves to said levers so that the several parts form a complete parallelogram, two sides of which made one with the door-leaves, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALPHONSE THEYSKEN S. 

